メタデータ
| 項目 |
値 |
| Designation |
396P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-08-29T03:15:14.060160Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T23:29:36Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-09.0000000 |
| e |
0.41780395 |
| q (au) |
3.983116 |
| a (au) |
6.841537 |
| i (deg) |
5.434040 |
| Ω (om, deg) |
136.663398 |
| ω (w, deg) |
8.678978 |
| M (ma, deg) |
333.720604 |
等級
散乱 + 全体線形
$$
M_a = (9.411 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.411 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.855 |
| k |
0.998 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:42:02.68 |
-17:00:10.7 |
HIP 102178 |
5.17 |
| 2026-03-26 12:00 |
20:42:12.74 |
-16:59:33.4 |
HIP 102178 |
5.16 |
| 2026-03-27 00:00 |
20:42:22.72 |
-16:58:56.4 |
HIP 102178 |
6.23 |
| 2026-03-27 12:00 |
20:42:32.62 |
-16:58:19.6 |
HIP 102178 |
7.93 |
| 2026-03-28 00:00 |
20:42:42.44 |
-16:57:43.0 |
HIP 102178 |
9.93 |
| 2026-03-28 12:00 |
20:42:52.19 |
-16:57:06.7 |
HIP 102178 |
12.07 |
| 2026-03-29 00:00 |
20:43:01.86 |
-16:56:30.7 |
HIP 102178 |
14.27 |
| 2026-03-29 12:00 |
20:43:11.44 |
-16:55:54.9 |
HIP 102178 |
16.51 |
| 2026-03-30 00:00 |
20:43:20.95 |
-16:55:19.4 |
HIP 102178 |
18.76 |
| 2026-03-30 12:00 |
20:43:30.37 |
-16:54:44.2 |
HIP 102178 |
21.02 |
| 2026-03-31 00:00 |
20:43:39.72 |
-16:54:09.2 |
HIP 102178 |
23.27 |
| 2026-03-31 12:00 |
20:43:48.98 |
-16:53:34.5 |
HIP 102178 |
25.51 |
| 2026-04-01 00:00 |
20:43:58.16 |
-16:53:00.1 |
HIP 102178 |
27.74 |
| 2026-04-01 12:00 |
20:44:07.26 |
-16:52:25.9 |
HIP 102178 |
29.95 |
| 2026-04-02 00:00 |
20:44:16.27 |
-16:51:52.1 |
HIP 102178 |
32.15 |
| 2026-04-02 12:00 |
20:44:25.20 |
-16:51:18.5 |
HIP 102515 |
31.59 |
| 2026-04-03 00:00 |
20:44:34.05 |
-16:50:45.2 |
HIP 102515 |
29.40 |
| 2026-04-03 12:00 |
20:44:42.82 |
-16:50:12.2 |
HIP 102515 |
27.24 |
| 2026-04-04 00:00 |
20:44:51.50 |
-16:49:39.4 |
HIP 102515 |
25.09 |
| 2026-04-04 12:00 |
20:45:00.09 |
-16:49:07.0 |
HIP 102515 |
22.97 |
| 2026-04-05 00:00 |
20:45:08.60 |
-16:48:34.8 |
HIP 102515 |
20.87 |
| 2026-04-05 12:00 |
20:45:17.03 |
-16:48:03.0 |
HIP 102515 |
18.79 |
| 2026-04-06 00:00 |
20:45:25.36 |
-16:47:31.5 |
HIP 102515 |
16.73 |
| 2026-04-06 12:00 |
20:45:33.61 |
-16:47:00.2 |
HIP 102515 |
14.70 |
| 2026-04-07 00:00 |
20:45:41.78 |
-16:46:29.3 |
HIP 102515 |
12.69 |
| 2026-04-07 12:00 |
20:45:49.85 |
-16:45:58.6 |
HIP 102515 |
10.71 |
| 2026-04-08 00:00 |
20:45:57.84 |
-16:45:28.3 |
HIP 102515 |
8.75 |
| 2026-04-08 12:00 |
20:46:05.74 |
-16:44:58.3 |
HIP 102515 |
6.83 |
| 2026-04-09 00:00 |
20:46:13.55 |
-16:44:28.6 |
HIP 102515 |
4.95 |
| 2026-04-09 12:00 |
20:46:21.27 |
-16:43:59.3 |
HIP 102515 |
3.17 |
| 2026-04-10 00:00 |
20:46:28.90 |
-16:43:30.2 |
HIP 102515 |
1.72 |
| 2026-04-10 12:00 |
20:46:36.44 |
-16:43:01.5 |
HIP 102515 |
1.71 |
| 2026-04-11 00:00 |
20:46:43.89 |
-16:42:33.1 |
HIP 102515 |
3.12 |
| 2026-04-11 12:00 |
20:46:51.25 |
-16:42:05.0 |
HIP 102515 |
4.82 |
| 2026-04-12 00:00 |
20:46:58.52 |
-16:41:37.3 |
HIP 102515 |
6.56 |
| 2026-04-12 12:00 |
20:47:05.69 |
-16:41:09.9 |
HIP 102600 |
7.39 |
| 2026-04-13 00:00 |
20:47:12.78 |
-16:40:42.8 |
HIP 102600 |
6.09 |
| 2026-04-13 12:00 |
20:47:19.76 |
-16:40:16.1 |
HIP 102600 |
5.07 |
| 2026-04-14 00:00 |
20:47:26.66 |
-16:39:49.8 |
HIP 102600 |
4.51 |
| 2026-04-14 12:00 |
20:47:33.46 |
-16:39:23.7 |
HIP 102600 |
4.56 |
| 2026-04-15 00:00 |
20:47:40.17 |
-16:38:58.1 |
HIP 102600 |
5.18 |
| 2026-04-15 12:00 |
20:47:46.78 |
-16:38:32.7 |
HIP 102600 |
6.18 |
| 2026-04-16 00:00 |
20:47:53.30 |
-16:38:07.8 |
HIP 102600 |
7.39 |